Roller-replacing tool for watchmakers.



Gn W. BGWERS.

ROLLER RBPLAGING TooL PoR WATGHMAKERS.

APPLICATION FILED JAN. 22, 1909.

AnuREw. u, GRAHAM C0.. PuamMnwnRm-IERS. wns'mmcmo. c.

UNrrn' frans "iD-AT GEORG-E W. BOWERS, OF SOMERVILLE, MASSACHUSETTS,ASSIGNOR, BY IVIESNE ASSIGN- MENTS, TO HAMMEL, RIGLANDER @c CO., OF NEWYORK, N. Y., .A CORPORATION F N EW YORK.

ROLLER-REPLACING TOOL FOR WATCHMAKERS.

To all whom it may concern:

Beit known that I, GEORGE IV. BOWERS, of Somerville, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in- Roller-Replacing Tools for 1Watchmakers, ofwhich the following is a specication.

This invention relates to tools for applying to the staff of a watchbalance the disk known as the roller, said disk having an orifice whichhas a tight frictional fit on one end portion of the balance staff, sothat a considerable pressure is required to force it to place on thestaff.

The invention has for its object to provide a simple, convenient, andefficient tool adapted to perform this operation without subjecting thestad and roller to injurious strain or pressure.

The invention consists in the improvements which I will now proceed todescribe and claim.

Of the accompanying drawings, forming a part of thisspecification,-Figure 1 represents a side elevation of a tool embodyingmy invention. Fig. 2 represents a section on line 2-2 of Fig. 1.

The same reference characters indicate the same parts in both iigures.

In the drawings, 12 represents a forked holder having two arms 13 and14, and a shank 15 to which a handle or hand grip 16 is attached. To thearm 13 is ailixed a stud 17 which projects into the space between thearms, and has a small center socketor cavity in its end adapted toengage the corresponding end of a balance staff 18. The arm 14 isprovided with a guiding socket 19, the bore of which is in alinementwith the stud 17.

20 represents a plunger which is movable in the socket 19 toward andfrom the stud 17. The end of the plunger which projects into the spacebetween the arms 13 and 14 is provided with a cavity 22 adapted toreceive the end portion of the balance staff to which the roller 21 isapplied, as shown in Fig. 2, the end of the plunger surrounding saidcavity being flat and adapted to bear squarely against the roller 21,and press the same to place on the balance stati", the rectilinearmovement of the plunger causing this operation to be performed withoutinjurious or twisting strain on the balance staif or on the roller.

Specicaton of Letters Patent.

Application filed January 22, 1909.

Patented Nov. 2, 1909.

serial No. 473,727.

An operating lever is mounted on a fulcrum pin 23 engaged with theforked holder 12, said lever having a curved shorter arm 24 which isslidingly engaged with the plunger 20 by suitable means, such as ashoulder 25 and a pin 26 on said plunger, said shoulder and pin bearingloosely on opposite sides of the curved arm 24. The operating lever hasa longer arm 27 which is located beside the handle 16, said longer armand handle being so arranged that both can be grasped by the operatorshand, the closing of which forces thel longer arm of the lever towardthe handle and causes the shorter arm to project the plunger 20. Aspring 28 afIiXed to the longer arm 27 and bearing against the handle,normally holds the lever in the position indicated by dotted lines inFig. 1, and thus retracts the plunger.

It will be seen by reference to the full and dotted line positions ofthe lever shown in Fig. l, that the shorter arm of the lever is engagedwith the shoulders 25 and 26 of the plunger 20 in all positions whichthe lever is capable of assuming, while its spring 28 is in contact withthe handle 16. When the lever is in the extreme retracted position, itsouter arm being in the left-hand dotted line position indicated in Fig.1, its shorter arm is nearly but not quite disengaged from the shoulderson the plunger, so that while the lever is adapted to again project theplunger when its longer arm is forced inwardly toward the handle, it isalso adapted to be entirely disengaged from the plunger by a furtheroutward movement of its longer arm from the outer dotted line positionshown in Fig. 1, this movement causing the shorter arm to be entirelywithdrawn from engagement with the plunger 20, thus releasing theplunger and permitting it to be withdrawn from the socket 19, so that aplunger may be conveniently withdrawn from the socket and anothersubstituted for it. It will be noted that the plunger is entirelyindependent of the spring which retracts it, the spring being attachedto the lever, so that it is not removable from the device with theplunger.

From the foregoing, it will be seen that the described tool is of simpleconstruction, the number of parts being rela-tively small, and that thetool is adapted to replace a roller without injury either to the rolleror the balance staff.

l claim: i Y n Y Y A tool of the oharaoter' stated, Comprising atwo-armed holder, an inwardly progecting stud 4a-flixed to one arm ofthe holder,'and y formed at its inner endete engage one end of a balancestaff, the other arm being provided Wlth a guide socket 1n allnementwith said stud, a plunger movable endwise in saidV socket and having inone endian elongated Cavity to receive the other end portion of abalance stall', and lever-'engaging shoulders at its other end, the endyol the plunger surrounding Said cavity being formed to press a rolleryupon the staff, a handle aliXed to the holder and extendingSubstantially at a rightangle with the plunger, a lever pivoted totheholder between the handle and plunger, and having a curved shorter armslidingly engaged VWith the shouldersV on the plunger, andra longeroperating arm located beside the handle, and a spring attached atoneirend to thelonger arm of the lever, its V- other end being Vinsliding Contact with the handle, the lever' being normally held by thespring in engagement with the shoulders of the plunger to prevent theWithdrawal of the plunger from the Socket, and adapted to be retractedbeyond theV point to which itis normally retracted by the spring, todisengage thershorter arm of the lever from the plunger, and permit theremoval of thek latter. Y Y

y In testimony whereof I have aflixed my signature, 1n presence of tvvoWitnesses.

GEORGE vv. BOWERS. f

Witnesses: Y Y

QF. BROWN, P. W. PEZZETTI-

